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If z=x-iy and z^(1/3)=p+iq, then (1)/(p^...

If z=x-iy and `z^(1/3)=p+iq`, then `(1)/(p^(2)+q^(2))((x)/(p)+(y)/(q))` is equal to

A

`-2`

B

`-1`

C

1

D

2

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